Death of a Demon

When Death of a Demon enters the battlefield,
red creatures you control gain first strike and
+1/+0.
{r}:Red Creatures you control gain trample until
Death of a Demon leaves the battlefield.
{r}{r}:Red creatures you control gain +1/+0 until
Death of a Demon leaves the battlefield.
{r}{r}{r}:Target red creature you control gains
"Sacrifice this creature, deal 6 damage to target
creature and add a {r} to your mana pool".